Really guys, this again? It gets posted on every piece of content that can be related to the Library.
Literally EVERY piece of content that can be related to the Library.
Every piece of content that can be related.
Every piece of content.
Every piece of content.
Every piece of content.

Doctor who - Silence in the library/Forest of the dead
Basically 'alien bugs' eat the flesh of these archaeologists and the suits they are wearing retain a small amount of their life causing the suits to continually repeat their last words before they died, so when they died in the episode you'd know because they'd start repeating themselves